Description:
------------
The Symfony framework provides a handy console command to start php's built-in webserver for a Symfony project. Running Symfony 3.2 RC1 on php 7.1 RC6, this command exits with a segmentation fault.

See https://github.com/symfony/symfony/issues/20580 for details.

To reproduce this problem, checkout https://github.com/symfony/symfony-standard/ at branch 3.2, install the vendors and run

./bin/console server:run

Open the browser at `http://localhost:8000/` and reload the page.

The `server:run` command launches php as an external process. What it essentially does is running the following command from the projects "web" folder.

php -S 127.0.0.1:8000 ../vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/router_dev.php

If there's something I can do to trace down the issue, please let me know.

Actual result:
--------------
$ php -S 127.0.0.1:8000 ../vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/router_dev.php
PHP 7.1.0RC6 Development Server started at Mon Nov 21 16:27:44 2016
Listening on http://127.0.0.1:8000
Document root is /Users/rabus/PhpstormProjects/symfony-standard/web
Press Ctrl-C to quit.
[Mon Nov 21 16:27:50 2016] 127.0.0.1:51219 [200]: /
[Mon Nov 21 16:27:50 2016] 127.0.0.1:51220 [200]: /_wdt/e168e6
Segmentation fault: 11